StackOptic
Back to Search
astrometry.net favicon

astrometry.net

https://astrometry.net· First analyzed 19 May 2026· Updated 19 May 2026
Export
astrometry.net
Desktop screenshot of astrometry.net
Mobile screenshot of astrometry.net
Mobile

Sponsored

Hosting Provider

New York University

IP Address

216.165.26.52

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 New York, United States

ASN

AS12

Organization

New York University

Server

Nginx

Nameservers

ns-91-b.gandi.net.ns-85-a.gandi.net.ns-185-c.gandi.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
398 ms10%
Speed Index
517 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
13 KB
5 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
New York University

Technology Stack

1 Technologies Detected

Web Servers

1
Nginxv1.24.0

SEO Analysis

F36/100
11
8
2
Meta Tags4/15
Content5/12
Headings6/8
Technical5/21
E-E-A-T0/7
Images0/7
Links4/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
A
astrometry.netastrometry.net

Astrometry.net

No description available for this page.

Title Length14 chars

Recommended: 50-60 chars (~87px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing meta description — important for click-through rates in SERPs
  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

10 issues found

Upgrade to view details

Local SEO

Local Search Readiness

0/100
Poor
15 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F32/100
Bot Access
20/25
Machine Read.
7/25
Schema Data
0/25
Citation
5/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txt
llms-full.txt
Semantic HTML
Heading Hierarchy
Text ratio:57%
Words:182
Token eff.:Too Short

Structured Data

No Schema

Citation Readiness

Opening Summary44w
Descriptive Headings
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (10)
AI readiness recommendation preview...
Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
B
71/100
9
Passed
4
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
11/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
15/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
9/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
1/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 recommendations
  • •Accessibility recommendation preview...
Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
61/100
A+
2 mg
CO₂e / view
13.3 KB
Page Weight
95%
Cleaner Than
New Visitor
2 mg
vs
Returning (cached)
<0.001 g
Annual (10K/mo)
192 g
Emission Segments
Data Center
<0.001 g
Network
<0.001 g
Device
<0.001 g
Resource Breakdown
Images
595 B
CSS
11.4 KB
HTML
1.4 KB
Green Hosting Not Verified
New York University
3 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
B

Security Score

71%Good
Static / Informational

HTTPS

No WAF

83d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

13.05.2026

Valid Until

11.08.2026

Subject Alternative Names (1)

astrometry.net

SHA-256 Fingerprint

83:7C:4D:84:39:5C:AA:2A:E9:52:7D:41:47:7D:69:24:88:71:AB:57...

Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

connection
keep-alive
content-encoding
📦 Gzip(gzip)
content-type
text/html
date
Tue, 19 May 2026 17:10:52 GMT
etag
W/"670145b4-8ae"
last-modified
Sat, 05 Oct 2024 13:57:08 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

70

SPF
DKIM
DMARC

MX Records (1)

mail.astrometry.net

Domain Information

astrometry.net

Domain Age
21y 10m

Created

27.07.2004

Expires

27.07.2028

Last Updated

05.01.2026

Registrar

Gandi SAS

DNSSEC
Not Enabled

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
F
38/100
Not Mobile Friendly
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
4 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

helvetica + verdana

WCAG Partial
48/100
Readability
/30
7/30

10px · LH 2.19

Hierarchy
/20
11/20

2.73x ratio

WCAG
/25
16/25

4:1 min contrast

Performance
/25
14/25

2 fonts

Heading Font

helvetica

Sans28px

Body Font

verdana

Sans10px

Contrast Ratio

4:1

1 issue

Reading Comfort

~106 CPL

Too wide
28px
h1
10px
p

❌ Critical: 10px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Wide line spacing (2.19). 1.4–1.6 is optimal for body text.

❌ Very long lines: ~106 chars/line causes eye strain. Add max-width constraint.

⚠️ Hard to read: Flesch score 30/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 4.0:1).

✅ Strong hierarchy: Headlines are 2.7x larger than body text.

Buy on MyFontsFlesch 30

Color Palette

3 unique colors
Light
#ffffff
Background· 75.60000000000001%

Sponsored

Scripts & Styles

1 Resources

0
Scripts
1
Styles
0
Async
0
Defer

Top Script Sources

Website Identity

astrometry.net

21 years old
Location detected: 🇺🇸 United Statesvia ip
Gandi SAS

Sponsored

Last analyzed: 19 May 2026 at 17:11

Historical Analysis & Change Tracking